Internal brake for automobiles



DefifQ' 1935. vi B, TAYLOR 2,022,947

INTERNAL BRAKE FOR AUTOMOBILES Filed Deo. 30, 1931 2 Sheets-Sheet 1 mw 771 yz off Dc. 3,1935. v. B. TAYLOR 2,022,947,

INTERNAL BRAKE FOR AUTOMOBILES Filed Dec. 50, 1931 2 Sheets-Sheet 2 Patented Dec. 3, 1935 UNITED STATES esisti-tiri; oFr-'Ic-E 2.022.947 h INTERNAL Bam Foa AUTOMOBILES Van B. Taylor, Miami, Fla.

Application Decemberu, 1931, Serial No. 583,884 comms. (el. iss-79.5)

This invention relates to automobile and other vehicle brakes, and has for its object the production oi a simple and efficient mechanism for automatically adjusting the brake shoes for vthepurpose oi' causing the brake shoes to eiilciently grip the brake drum when the brakes arel applied.

Another object of this invention is the production of a simple and eillcient internal brake for motor cars and other vehicles which is selfadjusting andmay be kept in perfect adjustment by the forward and backward travel of the brake pedal without the necessity of. 'employing mel which will apply the pressure evenly to all parts of the brake lining and brake drum by applying pressure at four equal points around the circumference o! the drum.

With these and other objects in view,'this in vention consists in certain combinations. ar' rangements and formations ofparts as'will be hereinafter more iully described and claimed. In the drawings:- Y Figure 1 is a vertical sectional view through the brake drum showing the brake shoes and actuating mechanism in side elevation, certain parts being broken awayand shown infsection; V-

Figure 2 is a section 'taken on line 2;-2 of Figure 1;

JFigure 3 is a-vertical 3-3101 Figure 1; 4 .i

Figure ,4 is a section taken on line 4-4 of section taken on line '40-Figure 1;f

Figure 5 is a sectional 'VIevsnSimiIar to Illgurel 1 showingthe brake shoes applied in a braking. position:

l' Figureisa-sectiontakenonthelinef-Sof Figure 1 showing one o! the pawls in a complete ratchet engaging position illustrating the position of the pawls and ratchets when the brakes Y K Figures l'and 5. .,Suitable stop lugs -car' are released:

Figure Iv is ,a section taken on Aum. .1 -Torf,A Figure 5showing. the position of the ratchets and pawls when the brakes are applied. .h 1 .Byre'rerringtothe drawingaitwillbeseen that I designates the brake housing which may be supported inv anyV suitable or desired manner' in Figures l and 5.

and as usuale plurality 01 supported in any suitable or desired manner.

Each housing I supports a pair oi pivotaily mounted arms 2 which arms are connected by I means of links 3. One of the arms 2 may be con- 5 nected to a suitable brake operating rod 4.

The principal feature of the present invention is the production of a structure embodying means for permitting an internal adjustment of the brake within the brake housing I, and this struc- 10 ture comprises a pair oi brake shoes 8 which carry suitable brake linings 9 which liningsV are adapted to contact with the brake drum III, as is usual wlthbrakes of this type. The shoes 8 are pro- Y vided with bifurcated guiding lugs II which fit-15 over securing pins I2 carried by the housing I Vto hold the shoes against accidental displacement. 'Each shoe 8 is provided with a plurality of lugs I3 formed near the inner face thereof to which lugs I3 are pivotally secured the adjusting 20 'y nuts I4, these adjusting nuts I4 receiving the threaded or adjustable bolts I5. These threaded or adjustable bolts I5 are so mounted as to have the bolts I5 oi' each shoe 8 extend in converging relation toward the center of the drum III, as 2'5 shown clearly in Figures 1 and 5. These adjusting bolts -I5 preferably converge toward the hub or center of the drum and iall together at an apexpoint oi about` twenty degrees relative to Y tliediameter oi the drum. Each threaded adjust- 30 .ing bolt I5 carries a ratchet wheel I6 near -its innerend and these adjusting bolts I5. also are provided with projecting ends Il as lshown clearly As will be noted by carefully considered Figures 1 and 5, the operating arms 2 are so pivoted upon the housing I as to'pivotally support `one oi the arms 2 below the center of the housing and drum and the other varm above the center. Each of these arms 2 is provided with a projecting journal 40 ried by the housing l-a'gainst which the ends oi theiinks 2l rest' for limiting the inward movement 50 oithese links 20. AAs shown in 1 and 5, 4the brake shoes l are connected together and normally urged toward each other by means Iof the connecting springs' 2.3.

Thehousing' I 'upon-its. maniacs.alli` plurality of supporting standards 24 upon which standards 24 are pivotally mounted the pawls 25 in such a. position as to overhang'the ratchet wheels I6 carried by the respective adjusting boltsv I5, a separate pawl being used for each ratchet wheel, as illustrated clearly in Figures 1 and 5. Coil springs 26 are anchored at one end upon the housing I and engage the rear ends 2 1 of the pawls 25 for normally holding'the pawl engaging hooks 28 of the pawls 25 in contact with the ratchet wheels I6. It should be lunderstood that the adjusting bolts I5 are arranged in pairs connected to the opposite shoes 8, one adjusting bolt of each pair being threaded with a right-hand thread, and the other bolt of each pair being threaded with a left-hand thread-to provide a proper adjustment or spreading of the shoes 8 as the adjusting bolts I 5 are rotated.

The operation of the device is as follows:- As the arms 2 are swung, the crank arms |81 will also be swung, as for instance, in a forward direction, thereby spreading the links 20 apart and away from the .stop lugs 22, this action pulling the inner ends of the adjusting bolts I5 away from the center of thev drum and applying the brake shoes to a braking position. 'Ihis of course will bodily move the ratchet wheels 6 carried by the respective bolts I5 causing the teeth of the ratchet wheels to move to a position such as is illustrated in Figure 7. Should, however, the brake lining 9 wear to such an extent as to make the application of the brakes ineiiicient, the further swing of the arms 2 will cause the adjusting bolts I5,to be moved to such a position as to cause theV ratchet wheels i6 to be bodily moved beyond the distance of the length of one tooth ofthe ratchet wheel and cause the ratchet wheel engaging hook 28 of the pawl 25 to drop into engagement with the next succeeding tooth. As soon as the brakes.

are again released, the links 20 will move the adjusting bolts I5 back to their normal positions and due to the fact that the ratchet wheel I6 will engage the pawl 25, theselbolts I5 naturally will be rotated further extending thenuts vHl upon the length of the bolts I5 and adjusting the shoes 8- outwardly. Through 'the medium of this action, a very minute and proper, as well as uniform, ad-

throw of the brake pedal necessary to apply the brakes. l

From the foregoing description it will be seen that a very simple and eicient means has been provided for permitting-a proper adjustment voi? the brake shoes automatically within the 'brake' housing merely by the application of the foot pedal, the mechanism automatically adjusting the shoes to their proper position to insure eifective braking action.

It should be understood that certain mechanical changes in the construction and arrangement of parts may be employed without departing from the spirit of the invention, so long as these changes fall within the scope or .the appended claims.

Having described the invention, what is claimed ly/cnverging adjusting rods pivotally secured to ysaid brake shoes, means for providing engagement between said rods and brake shoes whereby the rotation of said rods will automatically adjust said shoes with respect to said drum, operating links engaging the ends of the rods of the respective brake'v shoes for moving said rods to and away from the center of said drum, means for rotating said adjusting bolts as said links are shifted, and means connecting said links with said operating levers.

2. A brake of the class described comprising a housing, a brake drum carried thereby, brake shoes carried by the drum, internally threaded members carried by said brake shoes in spaced relation, adjusting bolts fitting in, said internally threaded members, ratchets carried by the inner ends of said adjusting bolts, spring pressed pawls contacting with said ratchets, and means for bodily moving said bolts and ratchets longitudinally of said pawls for causing the rotation of said bolts when said ratchets are moved a predetermined distance whereby said shoes will be automatically adjusted relative to said drum.

3. A brake of the class described comprising a housing', a drum associated therewith, a pair of operating levers pivotally secured to said housing, one being secured to the housing above the center and the other being secured to the housing below the center, a plurality of brake shoes, each shoe carrying a pair of adjusting bolts, said adjusting bolts being inclined inwardly toward the center of said drum, and means operable Yfrom said levers andy engaging said bolts for adjusting said bolts longitudinally and relatively adjusting said shoes .with respect to said drum when said levers are swung beyond a predetermined 'dis- 35 tance.

4. A brake of the class described comprising a housing, a drum associated therewith, a pair of -operating. levers pivotally secured to said housing,

one being secured to the housing above the center 40 and the other being secured to the housing below 'the center, a plurality of brake shoes, each shoe carrying a pair of adjusting bolts, said adjusting bolts being inclined inwardly toward the center of said drum, means operable from said levers and engaging said bolts for adjusting said bolts longitudinally and relatively adjusting said shoes with respect to said drum when said levers are swung beyond a predetermined distance, links forv connecting said-levers, and yieldable means for normally drawingsaid shoes to a retracted position. f

5. A brake of the class described comprising a housing, a brake drum, brake shoes adjustably mounted within said drum, each brake shoe carrying a pair of threadedl adjusting bolts, said bolts being inclined'inwardly toward the center of said drum, a ratchet wheel carried by each bolt, a spring pressed pawl engaging each ratchet wheel and adapted to rotate said bolts when said so bolts are swung in one direction beyond a predetermined point, links engaging the endsof the bolts `of the opposite shoes, means engaging said links for moving said links to and away from the center of said drum for shifting said ratchet 55 wheels with respect toV said pawls, and means for limiting the inward movement of said links with respect to said drum and housing.

6. A brake of the class described comprising a housing, a'brake drum, brake shoes adjustably 'lo mounted within said drum, each brake shoe carrying a pair of threaded adjusting bolts, said vbolts being inclined inwardly toward the center of said drum, 'a ratchet wheel carried by each bolt. a spring pressed pawl ratchet u wheel and adapted to .rotate ma boia when ma bolts are swung in one direction beyond apredetermined point, links engaging the ends o! the bolts of the opposite shoes. means engaging` said links for moving said links to and away from the center of said drum for shifting said ratchet wheels with respect to said pawls, means for limiting the inward movement of said links with respect to said -drum and housing. and ,f

guiding means for guiding said brake shoes .inl their shifting movement.

7.. A brake mechanism of the class described comprising a brakedrum. brake shoes supportedl Aadjacent to said drum, individual longitudinally adjustable expansion means engaging each shoe for automatically adjusting said shoes upon the longitudinal adjustment of said expansion means. and swinging operating means` engasins'said expansion means for automatically adjusting said expansion means in proportion yto the amount of swinging movement of said operating means.

8. A brake mechanism of the blass described 1 comprisingr a. housing, a brake drum. brake shoes carried by said drum', longitudinally adjustable members pivotally secured tosaid shoes, operat ing means for swinging said adjustable members, 10 and means engaging said adjustable members 

